You can work with a couple meh players that are equally flawed, but your best bet might be to pick out your favorites and then cut one or two of the others. If they were upperclassmen, they'd be gone soon enough anyways, but you don't want to carry four of these guys for another 2-3 seasons.
I actually did have a pretty good year last year in Iba with three meh players that I inherited as sophomores, but there are a couple things I think really contributed to that:
1. None of them had to start. I recruited over them and let the freshmen (now seniors, juniors last year) run wild.
2. They were meh in very different ways. One of them had 23 defense but was around 70 in SPD, PER, BH, and P. One of them couldn't shoot, dribble, or pass worth a damn but was 65 DEF.
If they're meh in the same ways (and they do all look like low D, potentially good shooting/BH?), they're redundant. But either way, you want to recruit over them asap. As you well know.